I booted it in the most recent virtualbox twice and it hanged after 10 or so minutes while using firefox.
I booted it a third time, changed the video memory from 5mb to 32mb and it seems to be ok. It was runnig for 27 minutes.
I closed it and opened it again and it's been ok.
I also installed no-ip from mydsl.
It has 128mb ram assigned and no harddisk. It's running on a 2.80 pentium D.
That's all my troubleshooting sorry I don't have anything more specific.